View Full Version : Lunched Ford Ka Piston
Alpinestarhero
05-08-09, 10:59 AM
A while back, my dad had the fun job of tending to a ford Ka engine in a not-so-great-state.
From the engine, he extracted the following engine component. Enjoy these graphic images of a lunched piston :D
http://i165.photobucket.com/albums/u54/alpinestarhero/Close-Up%20Photography/DSC_0246.jpg
http://i165.photobucket.com/albums/u54/alpinestarhero/Close-Up%20Photography/DSC_0255.jpg
I've seen worse, on a Smashed SV engine.
now I'll go and have to try and find them. It was someones who lived abroad.
Was the rest of the Ka engine ok?
Alpinestarhero
05-08-09, 11:03 AM
yeeeaaaaa lets have more pictures of destruction like this. I find it quite interesting, I'm not sure why. I guess if you consider how much engine components go through, it almost feels as if this kind of thing is inevitable.
Was the rest of the Ka engine ok?
Suprisingly, the other 3 cylinders / pistons / valves associated with those three cylinders where fine. The engine damage was limited to just this one piston, and the valves needed a bit of cleaning.
I reckon a bit of filler would have than running again
The engine damage was limited to just this one piston, and the valves needed a bit of cleaning.
I don't believe that. The bore at least must have been proper faarked as well as the con rod and possibly the crank.
Thingus
05-08-09, 11:54 AM
KAs are known for that aren't they? You got mice?
Alpinestarhero
05-08-09, 12:48 PM
I don't believe that. The bore at least must have been proper faarked as well as the con rod and possibly the crank.
Well, yes, the bore was wrecked, and the con rod was replaced aswell I think. I'm not certain about the extent of damage to the crank
Well, yes, the bore was wrecked, and the con rod was replaced aswell I think. I'm not certain about the extent of damage to the crank
So it's like Trigger's broom then? :)
punyXpress
05-08-09, 02:49 PM
1930 Austin 7 ...
about max revs in third ( say 2800 rpm ) & summoning up more steam, when BANG! as I changed into top.
Crank whip & the extra end thrust from the clutch put the 2 central pistons out of their bores. When it was time to go down again, they couldn't as the rings had spread.
Mechanical mayhem as the crank carried on round but not much else.
Sharapnel went through the crankcase walls & the sump & the 2 middle rods twisted thenselves round the camshaft. 'twas a sorry sight.
7 miles from home so cranked her up on the 2 remaining cylinders ( starter was knocked off in the mayhem ) & drove home.
Replacement engine cost less than £1
ThEGr33k
05-08-09, 08:04 PM
Unfortunaly I cant see any of the pics here... Im stuck at work but I remember these being pretty bad.
http://www.apriliaforum.com/forums/showthread.php?t=123518
Someone over reving it with far too aggressive down changing. :rolleyes:
yorkie_chris
05-08-09, 08:16 PM
tale of yore
Now, we had it tough...
speedplay
05-08-09, 08:24 PM
So it's like Trigger's broom then? :)
FTW!
Tim in Belgium
05-08-09, 09:00 PM
1930 Austin 7 ...
about max revs in third ( say 2800 rpm ) & summoning up more steam, when BANG! as I changed into top.
Crank whip & the extra end thrust from the clutch put the 2 central pistons out of their bores. When it was time to go down again, they couldn't as the rings had spread.
Mechanical mayhem as the crank carried on round but not much else.
Sharapnel went through the crankcase walls & the sump & the 2 middle rods twisted thenselves round the camshaft. 'twas a sorry sight.
7 miles from home so cranked her up on the 2 remaining cylinders ( starter was knocked off in the mayhem ) & drove home.
Replacement engine cost less than £1
To get round this we fitted a phoenix crank and early renault 4 pistons and rods to our last Austin 7. It used to see 60 easy with a skimmed late 3 bearing ruby head, Tim Myall Cam and single SU, ruby rear axle, 4 speed close ratio box and some original nippy/speedy track rod arms on a bowed front axle, with one solidly located shock to prevent sideways movement. 16" rears and 17" fronts. It was proper bling!
Unfortunately the engine cost more than 1 GBP.
So it's like Trigger's broom then? :)
lol
A while back, my dad had the fun job of tending to a ford Ka engine in a not-so-great-state.
From the engine, he extracted the following engine component. Enjoy these graphic images of a lunched piston :D
http://i165.photobucket.com/albums/u54/alpinestarhero/Close-Up%20Photography/DSC_0255.jpg
Pah, that's a daily occurance if you own a Kawasaki KR-1, or a weekly one if you own a Suzuki RGV250, or monthly if you have a Yamaha RD350LC
markmoto
06-08-09, 08:50 PM
Unfortunaly I cant see any of the pics here... Im stuck at work but I remember these being pretty bad.
http://www.apriliaforum.com/forums/showthread.php?t=123518
Someone over reving it with far too aggressive down changing. :rolleyes:
oof that wins lol
Unfortunaly I cant see any of the pics here... Im stuck at work but I remember these being pretty bad.
http://www.apriliaforum.com/forums/showthread.php?t=123518
Someone over reving it with far too aggressive down changing. :rolleyes:
Yes thats is pretty nasty, ive read throught the thread and it never explains the cause of the 'mishap'. Only that is came back to a dealer in a non working state.....:confused:
ThEGr33k
07-08-09, 08:42 AM
Suspect over revving. Might have been another thread where that was mentioned. Basically if you were to change from 3rd to 1st for example, that causes the revs to go above the what the valve springs can handle you get valve float, that means the valves stay open longer than they should... This is what happens.
Suspect over revving. Might have been another thread where that was mentioned. Basically if you were to change from 3rd to 1st for example, that causes the revs to go above the what the valve springs can handle you get valve float, that means the valves stay open longer than they should... This is what happens.
Contact between valve and piston? The valve would have to be open slot longer for that to happen though......
ThEGr33k
07-08-09, 08:18 PM
Contact between valve and piston? The valve would have to be open lot longer for that to happen though......
Not that much longer to be honest, the exhaust valves for example shut just after the piston has gone through top dead centre, means if its just a few mm too far open then Woops! :(
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